Speaking on The Howard Stern Show on SiriusXM, the actor talked about his experience filming Spider-Man: Far From Home, in which he starred as Mysterio, aka Quentin Beck.
He admitted that his nerves got to him on the first day of shooting, having known that starring in a Marvel movie was 'hard'.
"That world is enormous," Gyllenhaal told host Howard Stern.
Recalling 'not being able to remember' his line, he continued: "I was freaking out.
"It was a scene with [Samuel L.] Jackson, Tom... there were a number of actors in that scene. And I remember not being able to remember my lines.
"I was the wooden board. And they were like, 'Whoa'.
"And I went up to Tom Holland and was like, 'Dude, help me out'.
"He's like, 'It's all good, man. Just relax'.
"It was like he was me in so many situations. And I finally did. I just put a lot of pressure on [myself] because I love that world."
While he didn't say who he spoke to next, Gyllenhaal added: "I had to walk up and be like, 'Look man, I just came off Broadway doing a one-man show for an hour and a half onstage, so I got this. Please, believe me'."
Elsewhere in the interview, Gyllenhaal also spoke about another difficult incident on set, having had to employ the 'pillow technique' while shooting a sex scene with Jennifer Aniston.
The two actors starred alongside one another in the 2002 film The Good Girl, in which Aniston's character enters into an affair with a retail co-worker played by Gyllenhaal.
Discussing sex scenes, Stern asked if Gyllenhaal had to warn Aniston of any 'protrusion' while filming.
Laughing, Gyllenhaal said: "Weirdly, love scenes are awkward because there are maybe 30, 50 people watching it.
"Maybe if you have a closed set, it's less. That doesn't turn me on. Most of the time, it's oddly mechanical, right?
"Also, it's a dance. You're choreographing for a camera [...] It's one of those things - it's like a fight scene, you've got to choreograph those things, and I always have tried."
He explained it had been Aniston's idea to use the 'pillow technique', continuing: "I do remember a pillow. Yeah, the pillow technique was used.
"That was just preemptive, and used - generally, always - when actually in a horizontal place in that movie."
Gyllenhaal added: "I think that was actually a Jennifer suggestion. I think she was actually very kind to suggest it before we began.
"She was like, 'I'm putting a pillow here'. That was it, that was all she said."
Featured Image Credit: Sony Pictures
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